Thanks for your question on Health Care Magic. I can understand your concern. By your history and description, in my opinion, your son is having either cough variant asthma or allergic bronchitis. So better to consult pediatrician and get done clinical examination of respiratory system for wheezing or rhonchi. Zyrtec is having levocetrizine. It is antihistamine. Along with this anti allergic drug , inhaled bronchodilators and inhaled corticosteroid (ICS) are useful in such cases. Since all these drugs are prescribed medicines, you need doctor s prescription for them. So better to first diagnose him and then start appropriate treatment. Hope I have solved your query. Wishing good health to your son. Thanks.